This is pure underground fight anime from an era when that meant something: no tournament brackets, no power scaling, just two martial philosophies trying to destroy each other across generations. The setup is brutally simple, a grudge match that never ended, passed down like a blood debt, and every fight exists only to prove one style superior. You're watching revenge that tastes like legacy, where the son has to answer for his father's victory by fighting a man who never stopped burning.

Years ago, Pro Wrestling and the secret, lethal martial art known as Nanshin Shadow Style met in an underground bout to settle which was the stronger discipline, and Nanshin Shadow Style won. In the present, the man who fought for Pro Wrestling has come back, intent on wiping out Nanshin Shadow Style by any means. Kiichi, son of the fighter who won that match, must now defend the style and keep it from vanishing for good. The result is a three-episode action and sports OVA built around martial arts combat.